Thread-cutting apparatus.



S. FREY. THREAD CUTTING APPARATUS.

APPLICATION FILED NOV. 2, 1911.

1,043,082. Patented Now/35,1912.

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COLUMBIA PLANOGRAPH CO-QWASHINUTUN. n. c.

SIMON FREY,'OF ZURICH, SWITZERLAND. v

THREAD-CUTTING APPARATUS.

Specification of Letters Patent.

Patented Nov. 5, 1912'.

Application filed November 2, 1911. Serial No. 658,202.

To all whom it may concern:

Be it known that I, SIMON 'FREY, a citizen of the Swiss Republic, and a resident of 17 Mythenstrasse, Ziirich, Switzerland, have invented certain new and useful Improvements in Thread-Cutting Apparatus, of

which the following is a specification.

Tl11S invention relates to improvements in thread cutting devices of that class wherein the cutting dies are so arranged and constructed that movement of one thereof Wlll adjust the remainder, correspondingly to the adjustment of the first or master die.

The invention has to do with an improved form of adjusting means whereby a gradual or setting adjustment may be accurately effected, said adjusting means being also arranged to afford a relatively rapid separation of the dies to permit insertion and withdrawal of the work to be threaded, and the return of the dies to a set position obtained by the first mentioned adjusting means.

The invention also includes a novel form of dies by which the mechanism for adjustment thereof may be operable in the same direction regardless as to whether the dies are for cutting a right or lefthand screw thread.

The invention will be fully described in connection with the accompanying drawings and will be more particularly pointed out in and by the appended claims.

In the drawings :Figure 1 is a plan view, partly in section and partly in elevation, of a thread cutting mechanism embodying my invention. Fig. 2 is a sectional view on the line C-D of Fig. 1. Fig. 3'is a sectional view on the line A.-B of Fig. 2. Fig; 4 is a sectional view on the line 4 4 of Fig. 1. Fig. 5 is a sectional view on the line 55 of Fig. 1. Figs. 6 and 7 are detail views showing dies constructed according to my invention.

Similar characters of reference refer to similar parts throughout the several views. Referring to the drawings,a designates a body portion. of the stock, provided with an internally disposed square frame 7), in which A set screw f having pins f and f at its ends, is mounted in the cavity a, and is adapted to be rotated and moved axially. A carrier 9 is mounted, to be actuated upon rotation of the set screw f, through the threads thereof, and projects through a slot Z) in the frante 6, into arecess 1 in the die 1. As

will be seen from an inspection of Figs. 1 and 3, the die 1 can be moved either by axially sliding the set screw for by actuating the carrier 9 through rotation ofthe latter. The set screw f is-provided with a beveled gear lnwith which meshes a beveled gear 70 secured to the end of a shaft 2'. The shaft 6 is provided, at its end opposite the gear 70 with anut i, so that the set screw maybe rotateclby a key through the'coactlnggears h and la, and thereby the dies accurately moved to the desireddiameter of the thread to be cut. 4

Thepin f is mounted in a groove m, semi-circular in cross section, formed in an angular member m, which is slidably mounted in an opening a in the wall of the stock body a'.

The member m is providedwitha key m, situated in the groove m, whichv key projects into an annular groove in the pin 7, so that when moving the member m, the set screwf is axially displaced and thereby also the dies through the carrier 9. The upper edge of the slide m is provided with a rack m for coaction with a toothed wheel 11. The latter is fixed on the end of a shaft 0, the .opposite end of which is provided with a nut 0. Upon turning the latter, by means of a key, the

wheel at can be turned and thereby the menu-- ber m moved carrying with it the set screw f coupled therewith and the dies through the carrier 9. By this arrangement of parts it is possible to quickly disengage the dies from the piece of work, that is to say, after a smallturn of the nut 0, to take the stock and dies from onepiece of work to another requiring the same thread and bringing the dies back again to exactly their original positions, without readjustment through the nut 2". The axial displacement of the set screw f brings the gear h out of engagement with 'the' gear 7c, and thereby adjustment is rendered impossible through the nut i. Both of the cavities c and cl are placed in communication with each other by a groove ya, so that lubricating liquid, which may be contained therein, can flow from the one cavity into the other. A.

conical plug 9 is arranged in the groove 10,

which plug is semi-circular in cross section at its end, so that when it is in the position shown in Figs. 1 and 2, the liquid can flow from both the cavities c and d through the groove 79 into a port 1 in the frame 6. The surface of the die 3, which comes against the frame 6, is provlded with a recess s from which a port t runs to the cutting surface of the die 3. The liquid flows from the port 1' into the recess 8 and from there through the port If to the cutting surface of the die 3, where it moistens thesurface of the piece of work, for example a tube, and

thus facilitates the operation.

as shown in Fig.- 3, by manually turning the head. On one side of the stock body is re- .movably secured a plate u having a circular The plate u 1s removably se-.

opening a. cured to the stock body by means of a nut u. The dies 1, 2, 3 and a can be taken out of the frame I) and replaced by others after the removal of the plate u. A plate o is secured to the opposite side of the stock body by means of screws, and closes the cavities 0, d and e. The plate a; is also provided with a circular opening 1) for passing the piece of work through. Openings w may be provided for receiving the supports of a' stock guide, not shown in the drawings.

The stock body is rotated by any suitable means not shown in the drawings. In the plate a is an opening u" through which a part of the side of .the carrier 9 is visible, which part is provided with a mark 9. An inclinedsurface a; on the plate a, which is provided with graduations, (not shown in the drawings), by means of which, and the aid of the mark 9, the position of the dies may be determined in order to enable the cutting of threads of certain diameters.

Figs. 6 and 7 inclusive, show the square frame Z) of the stock and the carrier 9 which projects through a slot 7) into a recess 1 in the die 1. By actuating the carrier 9 the dies are moved on each other and the sides of the frame as previously described. This causes the points a, formed as cutting edges, to move either toward the center of the piece of'work or away from the same, so that threads of different diameters can be cut 7 with the same dies.

cent dies, but are positioned on the recesses f* of the hypotenuse side. By this arrangement it is provided, that, when moving the spindle f in one direction, the dies of this set move in the same direction as those which have threads on the opposite hand. Hence, it is possible to use the same gradnations on the stock for either a set of dies for hight hand, or a set for left hand threads; it is unnecessary to mark dies right hand or left hand, as there is no possibility of mistaking one set for the other, and further, when disengaging the carrier spindle by sliding it, the dies of both sets can be moved in and out in the same direction.

I claim:

1. In a thread cutting apparatus, the combination with a stock and a plurality of coacting dies carried thereby and adapted to move toward or recede from a common center upon actuation of one of said dies, of a rotatably mounted and axially movable set screw carried by said stock, and a carrier operatively connected to one of said dies and said set screw to impart movement of the latter to the former, either by rotation of the set screw for setting the dies or axially moving the set screw for a relatively quick movement of the dies from the work and the return thereof to their original set position.

2. In a thread cutting apparatus, the combination with a stock and a plurality of coacting dies carried thereby and adapted to move toward or recede from a common center upon actuation of one of said dies, of a rotatably mounted and axially movable set screw carried by said stock, a carrier operatively connected to one of said dies and set screw to impart movement of the latter to the former, either by rotation of the set screw or axially moving the same, a toothe'd wheel carried by said set screw, a second toothed wheel carried by said stock and adapted to mesh with said first mentioned toothed wheel for setting the dies, and means for axially moving said set screw, whereby said toothed wheels are brought out of coaction, and imparting a relatively quick movement of the dies from the work and return thereof to their original set position.

3. In a thread cutting apparatus, the combination with a stock and a plurality of coacting dies carried thereby, and adapted to move toward or recede from a common center upon actuation of one of said dies, of a rotatably mounted and axially movable set screw carried by said stock, a carrier operatively connected to one of said dies and set screw to impart movement of the latter to the former either by rotation of the set screw or axially moving the same, a toothed wheel carried by said set screw, :1 second toothed wheel carried by said stock and adapted to mesh with said first mentioned toothed wheel for setting the dies, and a member operatively connected to said set screw and carried by said stock for axially moving the said set screw, whereby said toothed Wheels are brought out of coaction and imparting a relatively quick movement of the dies from the work and return thereof to their original set position.

4. In a thread cutting apparatus, the combination with a stock and a plurality of coacting dies carried thereby adapted to move toward or recede from a common center upon actuation of one of said dies, of a rotatably mounted and axially movable set screw carried by said stock, a carrier operatively connected to one of said dies and set screw to impart movement of the latter to the former either by rotation of the set screw or axially moving the same, a toothed Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

wheel carried by said set screw, a second toothed wheel carried by said stock and adapted to mesh with said first mentioned toothed wheel for setting the dies, a toothed member operatively connected to said set screw and carried by said stock and a third toothed wheel coacting with said toothed member for axially moving the said set screw whereby said first and second mentioned toothed wheels are brought out of coaction, and imparting a relatively quick movement of the dies from the work and return thereof .to their original set position. In testimony whereof I aflix my signature in presence of two witnesses.

" SIMON FREY. Witnesses:

ALBERT LAEMMLER, CARL GUBLER.

Washington, D. G. 

